Securely scrubbing Sun fileserver disk

[Murky at cup.portal.com]

I need to bring a fileserver which has classified info on it out of the
secure area.  In order to do this, the disk must be scrubbed of all data
according to DoD guidelines.  I know Sun sells software to do this but
management is balking at paying the $1000 Sun wants for the capability
which will only be used once.  I am looking for alternative ways (read
cheaper) of doing this.  Any pointers to PD software or possibly manual
procedures which can do the trick?

Murky at cup.portal.com